Crispy Tempeh Arugula Sandwich with Garlic Truffle Aioli

Name: Crispy Tempeh Arugula Sandwich with Garlic Truffle Aioli
Prep time: 10 min
Cook time: 30 min
Total time: 40 min
Cuisine: American
Ingredients: 1/2 cup low sodium vegetable broth; 2 tbsp apple cider vinegar; 3 tbsp tamari (, or soy sauce (non-GF option)); 3 tbsp pure maple syrup; 3 cloves garlic (, minced); 1 tbsp olive oil; 1/4 teasp chipotle chili pepper powder; 1/8 teasp smoked paprika; freshly ground black pepper (, to taste); 8 oz. package tempeh; 8 slices bread (, such as sprouted wheat or sourdough); baby arugula leaves; 5-6 tbsp Roasted Garlic Truffle Aioli; 2 avocados (, cut in half and pitted); 2 vine-ripe tomatoes (, sliced); vegan butter (, such as earth balance, or oil for grilling)